Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1985-10-03
1986-12-09
Levy, Stewart J.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73826, 73859, G01N 308
Patent
active
046272933
ABSTRACT:
A lumber testing apparatus incorporates opposed wedges to simultaneously exert tension and clamp forces on boards being tested. The inclined wedge surfaces utilize bearing materials and wedge angles selected to match the required clamp forces to tension forces on each board, without crushing the boards at high loads. This is accomplished by using bearing materials having a variable coefficient of friction under varying load conditions.
REFERENCES:
patent: 213586 (1879-03-01), Olsen
patent: 2245316 (1941-06-01), Amsler
patent: 2583885 (1952-01-01), Russenberger
patent: 3224259 (1965-12-01), De Nicola
patent: 3714820 (1973-02-01), Strickler et al.
patent: 4194402 (1980-03-01), De Nicola
Zhulev, "Methods of Increasing the Effectiveness of Test Machine Wedge Clamps", Apr. 1973, Ind. Lab., vol. 39, No. 4, pp. 669-670.
Levy Stewart J.
Metriguard Inc.
Raevis Robert R.
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